[protobuf] Dynamic Linking Error with Protocol Buffers in C++

[Devan Kuleindiren]

Hello,

I have been using Bazel and have been trying to use Protocol Buffers in 
C++. I’ve reproduced my issue using a small amount of code:

car.proto
————————
syntax = "proto3";

message Car {
    int32 wheels = 1;
}

I then compiled this using protoc (v3.0.0) to produce car.pb.h and 
car.pb.cc.

main.cc:
————————
#include <fstream>
#include "car.pb.h"

int main(void) {
    Car car;
    car.set_wheels(10);

    std::fstream f ("~/Desktop/car.pb");
    car.SerializeToOstream(&f);
}

BUILD:
————————
cc_binary(
    name = "main",
    srcs = ["main.cc"],
    deps = [":car_pb"],
)

cc_library(
    name = "car_pb",
    srcs = ["car.pb.cc"],
    hdrs = ["car.pb.h"],
    deps = [],
)

bazel build :main runs fine, but then when I run bazel-bin/main I get:

dyld: Symbol not found: __ZN6google8protobuf7Message20DiscardUnknownFieldsEv
  Referenced from: /Users/devankuleindiren/Desktop/PBTest/bazel-bin/main
  Expected in: flat namespace
 in /Users/devankuleindiren/Desktop/PBTest/bazel-bin/main
Abort trap: 6

I understand that this is a dynamic linking issue, but I don’t know whether 
it’s because I’m using Bazel incorrectly, because I’ve installed protocol 
buffers incorrectly or because of something else?

I’m running macOS Sierra 10.12.1. Also, I’ve tried setting 
DYLD_LIBRARY_PATH to /usr/local/lib (where the libprotobuf libraries seem 
to be installed).

Thanks,
Devan

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